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Si and Cu are cooled to a temperature of 300 K. Then resistivity?

1. For Si increases and for Cu decreases
2. For Cu increases and for Si decreases
3. Decreases for both Si and Cu
4. Increases for both Si and Cu

Correct answer: For Si increases and for Cu decreases

Solution

For silicon (Si), a semiconductor, resistivity increases as temperature decreases because fewer charge carriers are thermally excited. For copper (Cu), a metal, resistivity decreases as temperature decreases due to reduced lattice vibrations.

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